bool MidPointCollisionStrategy::execute(
const MultiframeSprite& obj1, const MultiframeSprite& obj2) const {
int COLLISION_DISTANCE =
obj1.getCurrentFrameref()->getWidth()/2 + obj2.getCurrentFrameref()->getWidth()/2;
float xobj1 = obj1.X()+obj1.getCurrentFrameref()->getWidth()/2;
float yobj1 = obj1.Y()+obj1.getCurrentFrameref()->getHeight()/2;
float xobj2 = obj2.X() + obj2.getCurrentFrameref()->getWidth()/2;
float yobj2 = obj2.Y() + obj2.getCurrentFrameref()->getHeight()/2;
return distance(xobj1, yobj1, xobj2, yobj2) < COLLISION_DISTANCE;
}
MultiframeSprite::MultiframeSprite(const MultiframeSprite& s) :
Drawable(s.getName(), s.getPosition(), s.getVelocity()),
frames(s.frames),
strategy( new MidPointCollisionStrategy ),
frameWidth(s.getFrame()->getWidth()),
frameHeight(s.getFrame()->getHeight()),
worldWidth(Gamedata::getInstance()->getXmlInt("worldWidth")),
worldHeight(Gamedata::getInstance()->getXmlInt("worldHeight")),
dt(s.dt),
currentFrame(s.currentFrame),
numberOfFrames( s.numberOfFrames ),
frameInterval( s.frameInterval )
{ }
ExplodingSprite::ExplodingSprite(const MultiframeSprite& s) :
MultiframeSprite(s),
chunks(),
freeList(),
frames() {
makeChunks_multi(Gamedata::getInstance()->getXmlInt(s.getName()+"ChunkSize"));
}
bool RectangularCollisionStrategy::execute(
const MultiframeSprite& obj1, const MultiframeSprite& obj2) const {
float left1 = obj1.X();
float left2 = obj2.X();
float right1 = left1+obj1.getFrame()->getWidth();
float right2 = left2+obj2.getFrame()->getWidth();
float top1 = obj1.Y();
float top2 = obj2.Y();
float bottom1 = top1+obj1.getFrame()->getHeight();
float bottom2 = top2+obj2.getFrame()->getHeight();
if ( right1 < left2 ) return false;
if ( left1 > right2 ) return false;
if ( bottom1 < top2 ) return false;
if ( bottom2 < top1 ) return false;
return true;
}
bool PerPixelCollisionStrategy::execute(
const MultiframeSprite& obj1, const MultiframeSprite& obj2) const {
RectangularCollisionStrategy strategy;
if ( not strategy.execute(obj1, obj2) ) return false;
// If we got this far, we know that the sprite rectangles intersect!
Vector2f p1 = obj1.getPosition();
Vector2f p2 = obj2.getPosition();
const Frame * const frame1 = obj1.getFrame();
const Frame * const frame2 = obj2.getFrame();
int o1Left = p1[0];
int o1Right = o1Left+frame1->getWidth();
int o2Left = p2[0];
int o2Right = o2Left+frame2->getWidth();
std::vector<int> x;
x.reserve(4);
x.push_back( o1Left );
x.push_back( o1Right );
x.push_back( o2Left );
x.push_back( o2Right );
std::sort( x.begin(), x.end() );
int o1Up = p1[1];
int o1Down = o1Up+frame1->getHeight();
int o2Up = p2[1];
int o2Down = o2Up+frame2->getHeight();
std::vector<int> y;
y.reserve(4);
y.push_back( o1Up );
y.push_back( o1Down );
y.push_back( o2Up );
y.push_back( o2Down );
std::sort( y.begin(), y.end() );
SDL_Surface* surface1 = frame1->getSurface();
SDL_Surface* surface2 = frame2->getSurface();
SDL_LockSurface(surface1);
SDL_LockSurface(surface2);
unsigned pixels1;
unsigned pixels2;
for (int i = x[1]; i < x[2]; ++i) {
for (int j = y[1]; j < y[2]; ++j) {
// check pixels in obj1 and obj2!
pixels1 = obj1.getPixel(i, j);
pixels2 = obj2.getPixel(i, j);
if ( pixels1 != 16711935 && pixels2 != 16711935) {
SDL_UnlockSurface(surface1);
SDL_UnlockSurface(surface2);
return true;
}
}
}
SDL_UnlockSurface(surface1);
SDL_UnlockSurface(surface2);
return false;
}